This.
Yes!
If the iPhone 7 was USB-C it would have solved a few problems. Namely being able to plug it in out of the box (they could have included a USB-C to USB-A adapter for everyone else). Then the headphones would have been compatible too. Not to mention the convenience of being able to charge your phone at maximum speed with your MacBook Pro charger.
The worst part is that Apple have now locked them selves in. Imagine the outrage from everybody that bought lightning headphones if they would decide to switch to USB-C for iPhone 8.
No, the worst part is that there is NO WAY WHATSOEVER to use Lightning headphones on a Mac -- any Mac, including the new MBPs.
Where's the logic in that!? Apple gives new iPhone customers a pair of Lightning EarPods and they can only be used on the iPhone 7, and some iOS devices. So where is the Lightning headphone to USB-C dongle?
Now I get they want to push wireless, but where are the W1 chipped AirPods, or any W1 chipped earbuds for that matter that make cross-platform use a reasonable replacement for a wired 3.5mm headphone jack?
The good news is, Apple has done just about everything possible to give people a reason NOT to buy Lightning headphones, or at leased those with a fixed cable like the Apple Lightning EarPods. Most good quality Lighting headphones I've seen have detachable cables, so buy a pair with a Lightning interface is really not going to upset people too much if Apple switches to USB-C (which I doubt). However, in the interim, there's no adapter of any kind available to use them on a Mac, nor anything else for that matter.
Including a free adapter in with the iPhone 7 may have been more than just to accommodate those with expensive 3.5mm headphones, but rather an acknowledgment that Lightning is a poor solution for headphones, and that they have no intention of every allowing someone to convert an analogue or digital signal for use with Lightning headphones.
It's a sad state of affairs.